Process for making waterproof compositions



Patented 13! 30, 1929'.

LESTER KIRSOHBRAUN, OF .EVANSTON, ILLILIOIS.

PROCESS FOILMAKING WATERPROOF COMPOSITIONS.

No Drawing. Original application filed September 4:, 1918, Serial No. 252,607. Divided and this application flled December 31,

- This application isa divisional application of an original application filed by me September 4th, 1918, Serial No. 252,607.

In this application I am-claiming generi- 5 cally the process hereinafter described as applying to all kinds of fibres, and also specifically as applied to fibre containing its nonfibrous constituents.

This invention relates to. improvements in waterproof composition and process of making same, and has among'its salient ob]ects to provide a composition consistlng essentlally of a matrix of colloidal material and a binder and a'fibrous filler made from corn l5 stalks, sugar cane and the like; to provide a process in which the colloidal materlal and the binder are so intimately amalgamated and mixed witheach other as to form in effect an emulsified matrix, which is non-sticky while in aqueous co'nditionand which when mixed with a fibre will flow readily and can be.

formed without sticking to the forming or sheeting mechanism; to prov de a process which permits the utilization of a relativelywaste product for the fibre or filler; to provide a product which 7 can be formed into paper and in which the paper may be made of light color by the utilization of a proper binder or can be made colored by the use of a color.-'

3 ing material such as dye or pigment.

Some years ago attempts were made to make paper from corn stalks." One of the commercial difficulties experienced in such a process was the expensive treatments neces- 'sary to free the paper from the associated cellular and glutinous matter contained in the .-corn stalks. In the present invention, however, the corn stalks can be ground up into finely divided condition. without the necessity 40 of thus completely removing the mibstances other than the fibre. It maybe desirable to remove certain of these other materials from the fibre, but not to the extent of making an expensive preliminary treatment. In fact in certain cases the cellular or glutinous material may be advantageously utilized in the formation ot the emulsified matrix, This is probably due to the colloidal characterof certain of the material contained in the corn stalks. In such cases the necessity of using any substantial percentage of other colloidal material may be obviate Describing the manner of carrying out the process. The corn stalks are first ground or 1920. Serial No. 434,390.

chopped up intocomminuted form and'then subjected to a digesting operation to'reduce them to a-more or less pulpy condition. If desired chemicals may be added to assist in the pulping operationand to remove more or less of the non-fibrous material. This pulpy mass is then transferred to suitable boaters prepare it :in the usual way for the paper forming operation and the emulsified matrix is also prepared. This may be'pre'pared as follows: An aqueous paste may be formed of 'material containing colloidal matter such as,

for example, clay,'which is stirred into the water and thinned to a pasty consistency. This aqueous paste is preferably hot, as for example, heated to a temperature below the boiling point of water such as 180 degrees Fahrenheit. Instead of preparing this paste entirely of clay and water a part of the pulp above referred to may be'su-bstituted in part or entirely for the clay. To this aqueous paste is then added a binder. If the color of the material is of no consequence, such bind ers as black asphalt which of course is normally sticky or adhesive and normally non-fluid or coal tars may belused. This binder of whatever character used,-is gradually added to the hot paste and at intervals during the addition of the binder to the paste hot water is added to the mixture. By regulating the temperature-pf the paste and binder and the addition of the hot water and the degree armature of the agitation of the mixture, the degree of dispersion ofthe binderthrough the paste particles can be varied within considerable limits. For example, the binder can be reduced to so finely divided condition that the.

any desired consistency by water can be formed into'sheets such as paper by passing it over a suitable paper machine either of the Fourdrinier type, the cylinder type or the to thoroughly disintegrate the fibres'and to t beater, and the two intimately mixed with "use. As the material dries the binder coalesces and intimately unites with the fibres. The particles of the binder form a continuous Waterproof body throughout the sheet. In

t certain cases it may be desirable to mould the composition instead'of sheeting it, as for example, in the case of conduits, receptacles and the like or in the formation of bricks.

I have described corn stalks as material from which the fibre may be obtained; Other .cane may be utilized as sugarcane, broom cane, Kaflir cane, or plants of a similar character.

I claim as my invention: 1. The roces's of making a felted waterresistant s eet on a paper making machine,

' the steps ,which comprise introducing a normally adhesive, fusible, normally non-fluid waterproof binder in its adhesive state to fibrous pulpihaving cellulosic colloid material contained in an aqueous vehicle therefor and effecting the dispersion of the binder in the presence thereof whereby to render it relatively non-adhesive, in felting the stock so formed and in permitting 'the evaporation of the water to cause the dispersed particles of the binder to resume its adhesive condition and unite with the fibres. I

:2. The process of forming a water-resistant felted sheet on a paper making machine, the steps which comprise introducing awaterproof normally adhesive and non-fluid bituminous binder to afluid vehicle having fibrous pulp and liberated cellulosic colloid material therein, effecting the dispersion of the binder in the presence of the fibrous pulp and its liberated colloidal material to convert it from an adhesive to a relatively non-adhesive state, sheetinglthe stock so formed on resume its adhesive condition and coalesce and unite with the fibres,

3. A process of making a water-resistant sheet on a paper making machine consisting in introducing a bituminous binder of a normall adhesive and non-liquid condition to a find vehicle containing fibrous pulp and its liberated colloidal material, effecting the thorough admixture and dispersion of the binder in the presence of the fibrous pulp contained in the aqueous vehicle by agitating the mixture to thereby render the binder substantially non-adhesive, passing the mixture over a paper forming machine and. felting the fibres and causing the evaporation of the water from the stock to cause the bituminous particles to regain their adhesive character and coalesce and unite with the fibres,

4. A process of forming a water-resistant felted sheet on a paper making machine consisting in dispersing a heat liquefied normally adhesive waterproof binding medium in thepresence of fibrous pulp and by means of a combination of colloidal material liberated from the fibrous pulp and an additional emulsifying agent, contained in an aqueous vehicle, to thereby convert the binder from an adhesive to anon-adhesive state, in felting the aqueous mixture containing the non-adhesive binder and the amalgamated fibre on a paper forming machine and in subsequently permitting the evaporation of the water from p the stock to thereby cause the dispersed particles of the binder to resume their adhesive characteristics and coalesce and constitute a.

waterproofing medium for the sheet.

5. The process of making a felted waterresistant sheet consisting in treating a normally adhesive waterproof binding medium to render it non-adhesive by subjecting the same to an agitating action in the presence of fibrous pulp containing colloidal material, passing the mixture thus formed over a paper making machine without substantial adherence thereto to felt the fibres and in drying the sheet to cause the binding medium to resume its adhesive condition and unite with the fibres and constitute a waterproofing medium for the sheet. g LESTER KIRSCHBRAUN. 

